Wire Size for 3.73 Amps
Typical copper wire gauges for 3.73 amps across common run lengths on a 120V circuit, sized to keep voltage drop under 3% and respect the NEC 240.4(D) small-conductor rule. At 3.73A the load sits in residential-branch territory where aluminum is not a typical conductor, so the table lists copper only. Actual install sizing depends on conductor material, insulation/termination temperature rating, cable type, ambient and bundling derates, and local code.
3.73A Wire Gauge by Distance
| Distance | Copper Gauge | V-Drop (Cu) | NEC Status |
|---|---|---|---|
| 25 ft | 14 AWG | 0.5856V (0.488%) | OK |
| 50 ft | 14 AWG | 1.17V (0.976%) | OK |
| 75 ft | 14 AWG | 1.76V (1.46%) | OK |
| 100 ft | 14 AWG | 2.34V (1.95%) | OK |
| 125 ft | 14 AWG | 2.93V (2.44%) | OK |
| 150 ft | 14 AWG | 3.51V (2.93%) | OK |
| 175 ft | 12 AWG | 2.58V (2.15%) | OK |
| 200 ft | 12 AWG | 2.95V (2.46%) | OK |
| 250 ft | 10 AWG | 2.31V (1.93%) | OK |
| 300 ft | 10 AWG | 2.78V (2.31%) | OK |
| 400 ft | 8 AWG | 2.32V (1.93%) | OK |
| 500 ft | 8 AWG | 2.9V (2.42%) | OK |
Copper gauges use the NEC 240.4(D) branch-circuit cap, not raw 75°C ampacity.
Also Calculate
Other Amperages
This calculator provides estimates for reference purposes only. Always consult a licensed electrician and verify compliance with the National Electrical Code (NEC) and local electrical codes before performing any electrical work.